CVE-2026-24032
Published: 14 April 2026
Summary
CVE-2026-24032 is a medium-severity Improper Verification of Cryptographic Signature (CWE-347) vulnerability. Its CVSS base score is 6.9 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 13.1th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 IA-2 (Identification and Authentication (Organizational Users)) and SI-2 (Flaw Remediation).
Deeper analysis
CVE-2026-24032, published on 2026-04-14, is an authentication weakness in the UMC component of SINEC NMS, affecting all versions prior to V4.0 SP3 with UMC. The vulnerability arises from insufficient validation of user identity, classified under CWE-347, and carries a CVSS v3.1 base score of 7.3 (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L).
An unauthenticated remote attacker can exploit this vulnerability over the network with low complexity and no user interaction required. Successful exploitation allows the attacker to bypass authentication and gain unauthorized access to the application.
Siemens has issued Security Advisory SSA-801704, available at https://cert-portal.siemens.com/productcert/html/ssa-801704.html, addressing this issue (ZDI-CAN-27564).
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-22233
Vulnerability details
A vulnerability has been identified in SINEC NMS (All versions < V4.0 SP3 with UMC). The affected application contains an authentication weakness due to insufficient validation of user identity in the UMC component. This could allow an unauthenticated remote attacker…
more
to bypass authentication and gain unauthorized access to the application. (ZDI-CAN-27564)
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Remote unauthenticated auth bypass in public-facing app directly enables T1190 for initial access.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Requires systems to identify and authenticate organizational users before granting access, directly addressing the insufficient validation of user identity that enables authentication bypass.
Mandates identification, reporting, and correction of flaws like this authentication weakness, enabling application of the Siemens patch to eliminate the vulnerability.
Enforces approved access authorizations in accordance with policy, providing a secondary layer to limit damage from unauthorized access gained via authentication bypass.